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Stockholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | $ 70,088 | $ 74,932
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  | (2) | (1)
Net other comprehensive (loss) income |  | (73) | 972
Ending Balance |  | 69,835 | 74,966
Pension Plan |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | (590) | 128
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax |  | (7) | 4
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  | 1 | 0
Net other comprehensive (loss) income |  | (6) | 4
Ending Balance |  | (596) | 132
Other Benefit Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | 79 | (53)
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax |  | 0 | 0
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  | 0 | 0
Net other comprehensive (loss) income |  | 0 | 0
Ending Balance |  | 79 | (53)
Cumulative Translation Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | (1,966) | (454)
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax | [1] | (68) | 957
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  | 0 | 0
Net other comprehensive (loss) income |  | (68) | 957
Ending Balance |  | (2,034) | 503
Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | (26) | (2)
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax |  | 4 | 12
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  | (3) | (1)
Net other comprehensive (loss) income |  | 1 | 11
Ending Balance |  | (25) | 9
Total |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | (2,503) | (381)
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax |  | (71) | 973
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  | (2) | (1)
Net other comprehensive (loss) income |  | (73) | 972
Ending Balance |  | $ (2,576) | $ 591
[1] | The cumulative translation adjustment gain for the three months ended March 31, 2018 was primarily driven by the weakening of the U.S. Dollar ("USD") against the European Euro ("EUR"), as well as the Danish Kroner. The cumulative translation adjustment loss for the three months ended March 31, 2019 was primarily driven by strengthening of the USD against the EUR and the Brazilian Real.

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